Tailoring Polymerization Controllability and Dispersity Through a Photoswitchable Catalyst Strategy.
Macromol Rapid Commun
; 44(18): e2300198, 2023 Sep.
Article
em En
| MEDLINE
| ID: mdl-37231589
ABSTRACT
Modulating on-demand polymerization is a challenge in synthetic macromolecules. Herein, tailoring polymerization controllability and dispersity during single-electron transfer mediated living radical polymerization (SET-LRP) of methyl methacrylate (MMA) is achieved. Hexaarylbiimidazole (HABI) is employed as a photoswitchable catalyst, allowing reversible control of catalytic activity between an active and inactive state. In the presence of HABI and with the light on (active state), control SET-LRP of MMA follows first-order kinetics, resulting in polymers with a narrow molecular weight distribution. In contrast, polymerization responds to light and reverts to their original uncontrolled state with light off (inactive state). Therefore, repeatable resetting polymerization can be easily performed. The key to photomodulating dispersity is to use an efficient molecular switch to tailor the breadths of dispersity. Besides, the mechanism of HABI-mediated SET-LRP with switchable ability is proposed.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Polímeros
Idioma:
En
Revista:
Macromol Rapid Commun
Ano de publicação:
2023
Tipo de documento:
Article